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New quantum algorithms promise an exponential speed-up for machine learning, clustering and finding patterns in big data. But to achieve a real speed-up, we need to delve into the details.

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Correspondence to Scott Aaronson.

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Aaronson, S. Read the fine print. Nature Phys 11, 291–293 (2015). https://doi.org/10.1038/nphys3272

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